Officials' Responsibilities & Positions | NFL Football Operations
Do College Football Refs Have It In for Your Team? - Bloomberg
Ask Sam Farmer: Are there throwback uniforms for NFL officials? - Los Angeles Times
Official (gridiron football) - Wikipedia
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Black officiating crew was right call for NFL Monday Night Football showcase | Sports Eye | stlamerican.com
Official (gridiron football) - Wikipedia
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SEC to experiment with 8 football officials, but what's right number? - CBSSports.com
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What do the letters stand for on the back of football referees' shirts? - Quora
NFL makes history with all-Black officiating crew for Monday night football
Two officials take big hits from Illinois players | Yardbarker
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From Harvard to Super Bowl: Ron Torbert to referee Sunday's game - The Boston Globe
Understanding College Football Officiating - The Crew And Their Keys - Corn Nation
Ask Farmer: Why do NFL referees have numbers? - Los Angeles Times
What do the letters stand for on the back of football referees' shirts? - Quora
NFL sees its first Cherokee referee in Phillips | News | cherokeephoenix.org
